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______________ who is a painter, draughtsman, engineer, scientist, theorist, sculptor and architect, is one of the most famous artists of the Renaissance.
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___________, who is a major general, military pilot, and China National Space Administration astronaut, became the first person sent into space by the Chinese space program in October 2003.
__________ is a Chinese pilot and astronaut who served as a crew member on the space mission Shenzhou 9. On June 16, 2012, she became the first Chinese woman in space.
电子计数器的基本组成有：输入通道、计数与显示电路、时基产生电路、控制电路。
输入通道是对输入信号进行放大、整形等，只有A、B两个通道。
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